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Reinsurance (Ceded Premiums and Losses Related to Flood Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Ceded premiums written $ (98,328) $ (93,391) $ (187,319) $ (180,565)
Ceded premiums earned (91,673) (86,780) (182,063) (172,369)
Ceded loss and loss expense incurred (42,289) (65,780) (87,571) (170,651)
National Flood Insurance Program [Member]
        
Ceded premiums written (65,775) (62,461) (123,078) (119,168)
Ceded premiums earned (59,213) (56,450) (117,499) (111,777)
Ceded loss and loss expense incurred $ (26,712) $ (51,725) $ (34,091) $ (127,901)